EP 0735027 B1 19970917 - Process for the preparation of (cyclo)aliphatic uretdiones with improved color quality
Title (en)
Process for the preparation of (cyclo)aliphatic uretdiones with improved color quality
Title (de)
Verfahren zur Herstellung von (cyclo)aliphatischen Uretdionen mit verbesserter Farbqualität
Title (fr)
Procédé de préparation d'uretdiones (cyclo)aliphatiques ayant une meilleure qualité de couleur
Publication
Application
Priority
DE 19510956 A 19950325
Abstract (en)
[origin: EP0735027A1] Prodn. of (cyclo)aliphatic uretdiones of improved colour by dimerisation, opt. in an inert solvent, of a (cyclo)aliphatic diisocyanate uses 0.5-3 wt.% amino-substd. pyridine catalyst of formula (I) and also 0.1-4 wt.% phosphorus cpd. of formula (II) and is such that (a) dimerisation is effected at 0-60 degrees C to a conversion of 5-70%; and then (b) without catalyst de-activation, the 1,3-diazacyclobutane-di-2,4-one is isolated as residue by thin film distn., with cpds. (I), (II) and the unreacted diisocyanate forming the distillate. P(R<3>)2R<4> (II), R<1> and R<2> = 1-8C alkyl or, together with the ring-bonded N, form a 5- or 6-membered ring in which one of the -CH2- gps. can be replaced by -CH(Me)-, -O- or -N(Me)-; and R<3> and R<4> = 1-10C aromatic or araliphatic hydrocarbon gp. (sic), OR<1> or OH.
IPC 1-7
IPC 8 full level
C07D 229/00 (2006.01); C08G 18/02 (2006.01); C08G 18/79 (2006.01); C08K 5/50 (2006.01)
CPC (source: EP US)
C07D 229/00 (2013.01 - EP US); C08G 18/027 (2013.01 - EP US); C08K 5/50 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0735027 A1 19961002; EP 0735027 B1 19970917; AT E158280 T1 19971015; DE 59600024 D1 19971023; ES 2107922 T3 19971201; JP H08269012 A 19961015; US 6624301 B1 20030923
DOCDB simple family (application)
EP 96101010 A 19960125; AT 96101010 T 19960125; DE 59600024 T 19960125; ES 96101010 T 19960125; JP 6829096 A 19960325; US 58808796 A 19960118